LED chip and manufacture method thereof

Abstract

The invention provides an LED chip which includes a substrate, an epitaxial layer formed on the substrate and composed of an N-type semiconductor layer, a light emitting layer and a P-type semiconductor layer, and an N-type electrode and a P-type electrode respectively and electrically connected with the N-type semiconductor layer and the P-type semiconductor layer. The LED chip further includes a photoluminescence film and / or a light filtering film on the surface of the substrate on the back of the LED chip. The LED chip is electrically connected with a PCB base plate so that photons can emit light from the substrate end through the photoluminescence film and / or the light filtering film. The invention further provides a manufacture method of the LED chip. By arranging the photoluminescence film on the surface of the substrate on the back of the LED chip, the light emitted by the LED chip can exit through the substrate via the photoluminescence film. Under the excitation of light in the blue and green regions, the LED emits monochromatic green and blue light with wavelength more concentrated. Thus, the extraction efficiency of monochromatic light is higher.

Description

technical field [0001] The invention relates to the field of semiconductor chips, in particular to an LED chip and a manufacturing method thereof. Background technique [0002] A light-emitting diode (Light-Emitting Diode, LED) is a semiconductor electronic component that can emit light. This electronic component appeared as early as 1962. In the early days, it could only emit red light with low luminosity. Later, other monochromatic light versions were developed. Today, the light that can be emitted has covered visible light, infrared rays and ultraviolet rays, and the luminosity has also increased to a considerable level. of luminosity. Because of its energy saving, environmental protection, safety, long life, low power consumption, low heat, high brightness, waterproof, miniature, shockproof, easy dimming, concentrated beam, easy maintenance, etc., it can be widely used in various indications, displays, decorations , backlight, general lighting and other fields. [000...

AI Technical Summary

Problems solved by technology

[0003] Regarding the LED chips in the blue-green color region, because the current blue-green LED chips on the traditional sapphire substrate grow n-GaN, InGaN / AlGaN quantum wells, and p-GaN sequentially on the sapphire substrate, they are heterojunction epitaxy structure, there are severe spontaneous polarization and piezoelectric polarization, so it is difficult to grow high-quality blue-green light epitaxy with good wavelength monochromaticity, usually the half-wavelength width of the chip is greater than 15nm+, the luminous spectrum is wide, and the luminous efficiency is low , especially when encapsulating white light, the excitation efficiency of the corresponding phosphor is low

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